A Braking Module and the matching braking resistor are needed by the drive when it brakes or needs to be stopped for a specific reason, e.g. for an EMERGENCY STOP. Large fans which are caused to rotate by air flow are a typical application. In such instances, it is important to consider operating states which could result in speeds in excess of the desired maximum speed but also the possibility of reversal of rotational direction during restart from standstill. A braking unit is also required if the fan must be brought to a standstill within a defined time period.
The Braking Module houses the power electronics and the associated control circuit. The supply voltage for the electronics is taken from the DC link.
During operation, the DC link power is converted into heat loss in an external braking resistor.
The activation threshold of the Braking Module can be adjusted by means of a switch. The braking power values indicated in the technical specifications apply to the upper activation threshold.